00872cam a2200241 4500 547802474 TxAuBib 19990602120000.0 990602s1967||||||||||||||||||||||||eng|u 67023865 /AC/r85 TxAuBib Adler, Irving. The calendar / [by] Irving and Ruth Adler. New York : John Day Co., [1967] 48 p : illus. (part col.) ; 22 cm. Their The Reason why books A history of the calendar from the primitive concepts of measuring time used by ancient civilizations to the Gregorian calendar invented in 1582 still used today. 19990602. Calendar Juvenile literature. Calendar. Adler, Ruth, joint author. Their The Reason why books.